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# Fall line (topography)

In mountain biking and skiing, a fall line refers to the line down a mountain or hill which is most directly downhill. [1]

## Alpine skiing

Alpine skiing, or downhill skiing, is the pastime of sliding down snow-covered slopes on skis with fixed-heel bindings, unlike other types of skiing (cross-country, Telemark, or ski jumping) which use skis with free-heel bindings.

## Contour line

A contour line (also isocline, isopleth, isarithm, or equipotential curve) of a function of two variables is a curve along which the function has a constant value, so that the curve joins points of equal value.

## Downhill mountain biking

Downhill mountain biking (DH) is a genre of mountain biking practiced on steep, rough terrain that often features jumps, drops, rock gardens and other obstacles.

## Enduro (mountain biking)

Enduro in its most basic definition is a type of mountain bike racing where the downhills are timed, and the uphills are not.

## Glossary of cycling

This is a glossary of terms and jargon used in cycling, mountain biking, and cycle sport.

In mathematics, the gradient is a multi-variable generalization of the derivative.

## Gravity

Gravity, or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light—are brought toward (or gravitate toward) one another.

## Hill

A hill is a landform that extends above the surrounding terrain.

## Line of greatest slope

In topography, the line of greatest slope is a curve following the steepest slope.

## Mountain

A mountain is a large landform that stretches above the surrounding land in a limited area, usually in the form of a peak.

## Mountain biking

Mountain biking is the sport of riding bicycles off-road, often over rough terrain, using specially designed mountain bikes.

## Single track (mountain biking)

Singletrack (or single track) describes a type of mountain biking trail that is approximately the width of the bike.

## Skiing

Skiing can be a means of transport, a recreational activity or a competitive winter sport in which the participant uses skis to glide on snow.

## Topographic profile

A topographic profile or topographic cut is a representation of the relief of the terrain that is obtained by cutting transversely the lines of a topographic map.

## Topography

Topography is the study of the shape and features of the surface of the Earth and other observable astronomical objects including planets, moons, and asteroids.

## References

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